NASA’s Planetary Science Division Director, Jim Green, talks to Alan Stern of the Southwest Research Institute, who is the Principal Investigator on NASA’s New Horizons mission, which flew past Pluto in July 2015.

NASA’s Planetary Science Division Director, Jim Green, talks to Alan Stern of the Southwest Research Institute, who is the Principal Investigator on NASA’s New Horizons mission, which flew past Pluto in July 2015.